/* =====================================================
   兒童臉部隱私保護工具 - Style Sheet
   ===================================================== */

/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #a5b4fc;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: #334155;
    --border-radius: 16px;
    --border-radius-sm: 8px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    background-image:
        radial-gradient(ellipse at top, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
}

/* App Container */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
    animation: fadeInDown 0.6s ease;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-emoji {
    font-size: 2.5rem;
    animation: float 3s ease-in-out infinite;
}

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Upload Section */
.upload-section {
    animation: fadeIn 0.6s ease 0.2s both;
}

.upload-zone {
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.upload-zone:hover,
.upload-zone.drag-over {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.upload-zone:hover::before,
.upload-zone.drag-over::before {
    opacity: 1;
}

.upload-zone.drag-over {
    border-style: solid;
    background: rgba(99, 102, 241, 0.1);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: bounce 2s ease-in-out infinite;
}

.upload-zone h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.upload-zone p {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-muted) !important;
}

/* Emoji Section */
.emoji-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    animation: fadeIn 0.6s ease 0.3s both;
}

.emoji-section h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-align: center;
}

.emoji-options {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.emoji-btn {
    width: 3.5rem;
    height: 3.5rem;
    font-size: 1.75rem;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.emoji-btn:hover {
    transform: scale(1.1);
    border-color: var(--primary-light);
}

.emoji-btn.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.2);
    box-shadow: var(--shadow-glow);
}

.size-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.size-control label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.size-control input[type="range"] {
    width: 150px;
    accent-color: var(--primary-color);
}

#sizeValue {
    color: var(--primary-light);
    font-weight: 500;
    min-width: 3rem;
}

/* Age Section */
.age-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    animation: fadeIn 0.6s ease 0.35s both;
}

.age-section h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-align: center;
}

.age-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.age-toggle {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.toggle-label {
    color: var(--text-primary);
    font-weight: 500;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: var(--bg-tertiary);
    border-radius: 28px;
    transition: all var(--transition-normal);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.toggle-switch input:checked+.toggle-slider {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.toggle-switch input:checked+.toggle-slider::before {
    transform: translateX(24px);
}

.age-threshold {
    display: flex;
    align-items: center;
    gap: 1rem;
    opacity: 0.5;
    pointer-events: none;
    transition: all var(--transition-normal);
}

.age-threshold.active {
    opacity: 1;
    pointer-events: auto;
}

.age-threshold label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.age-threshold input[type="range"] {
    width: 120px;
    accent-color: var(--primary-color);
}

#ageValue {
    color: var(--primary-light);
    font-weight: 500;
    min-width: 5rem;
}

.age-hint {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 1rem;
}

/* Progress Section */
.progress-section {
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    animation: fadeIn 0.3s ease;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
}

#progressText {
    color: var(--text-secondary);
}

#progressCount {
    color: var(--primary-light);
    font-weight: 500;
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width var(--transition-normal);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 1.5s infinite;
}

/* Preview Section */
.preview-section {
    animation: fadeIn 0.3s ease;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.preview-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.preview-actions {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.btn-small {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.875rem;
}

.btn-edit {
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    color: white;
    border: none;
}

.btn-edit:hover {
    transform: translateY(-1px);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.4);
}

.btn-compare {
    background: transparent;
    border: 1px solid var(--border-color);
}

.btn-compare:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-light);
}

.btn-compare.active {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
}

/* Preview Grid */
.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.preview-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    animation: scaleIn 0.3s ease;
}

.preview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.preview-image-container {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: var(--bg-tertiary);
}

.preview-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.preview-card:hover .preview-image {
    transform: scale(1.05);
}

.face-count-badge {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    backdrop-filter: blur(4px);
}

.face-count-badge.child {
    background: rgba(236, 72, 153, 0.8);
}

.preview-info {
    padding: 1rem;
}

.preview-filename {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.75rem;
}

.preview-card-actions {
    display: flex;
    gap: 0.5rem;
}

/* Comparison Slider */
.comparison-container {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    cursor: ew-resize;
}

.comparison-original,
.comparison-processed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.comparison-processed {
    clip-path: inset(0 0 0 0);
}

.comparison-divider {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 100%;
    width: 4px;
    background: white;
    transform: translateX(-50%);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    z-index: 10;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.comparison-container[data-comparing="true"] .comparison-divider {
    opacity: 1;
}

.comparison-divider::before {
    content: '⟨⟩';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    color: var(--bg-primary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
    box-shadow: var(--shadow-md);
}

.comparison-labels {
    position: absolute;
    bottom: 0.5rem;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0 0.75rem;
    pointer-events: none;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.comparison-container[data-comparing="true"] .comparison-labels {
    opacity: 1;
}

.comparison-label {
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    backdrop-filter: blur(4px);
}

/* Model Section */
.model-section {
    animation: fadeIn 0.6s ease 0.4s both;
}

.model-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
}

.model-status.ready {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.model-status.ready .loading-spinner {
    display: none;
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Install Button */
.install-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: 1rem;
    font-family: inherit;
}

.install-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: auto;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 1000;
}

.toast {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideInRight 0.3s ease;
    border-left: 4px solid var(--primary-color);
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--error-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

/* Edit Modal */
.edit-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 2000;
    display: none;
    flex-direction: column;
}

.edit-modal.active {
    display: flex;
}

.edit-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.edit-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 1rem;
}

.edit-toolbar-left,
.edit-toolbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.edit-tool-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.edit-tool-btn:hover {
    background: var(--border-color);
    border-color: var(--primary-light);
}

.edit-tool-btn.active {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
    color: var(--primary-light);
}

.edit-tool-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    color: white;
}

.edit-tool-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.edit-tool-btn.cancel {
    background: transparent;
    border-color: var(--text-muted);
    color: var(--text-muted);
}

.edit-tool-btn.cancel:hover {
    border-color: var(--error-color);
    color: var(--error-color);
}

.edit-emoji-select {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.edit-emoji-options {
    display: flex;
    gap: 0.5rem;
}

.edit-emoji-btn {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.25rem;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.edit-emoji-btn:hover {
    transform: scale(1.1);
    border-color: var(--primary-light);
}

.edit-emoji-btn.active {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.2);
}

.edit-canvas-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    overflow: auto;
    background: repeating-conic-gradient(#1a1a2e 0% 25%, #16162a 0% 50%) 50% / 20px 20px;
}

#editCanvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: var(--shadow-lg);
    cursor: crosshair;
}

.edit-hint {
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.edit-hint p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-5px) rotate(5deg);
    }
}

@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }

    100% {
        transform: translateX(100%);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .upload-zone {
        padding: 2rem 1rem;
    }

    .upload-icon {
        font-size: 3rem;
    }

    .preview-header {
        flex-direction: column;
        align-items: stretch;
    }

    .preview-actions {
        justify-content: stretch;
    }

    .preview-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .toast-container {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }

    .toast {
        width: 100%;
    }

    .edit-toolbar {
        padding: 0.75rem;
        justify-content: center;
    }

    .edit-toolbar-left,
    .edit-toolbar-right {
        width: 100%;
        justify-content: center;
    }

    .edit-tool-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8rem;
    }

    .edit-emoji-select span {
        display: none;
    }

    .edit-emoji-btn {
        width: 2rem;
        height: 2rem;
        font-size: 1rem;
    }

    .edit-hint p {
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .emoji-btn {
        width: 3rem;
        height: 3rem;
        font-size: 1.5rem;
    }

    .size-control {
        flex-direction: column;
        gap: 0.5rem;
    }

    .preview-grid {
        grid-template-columns: 1fr;
    }
}